Megger T22/13B Manuel utilisateur

Instruction Manual

Date of release: 2003/ 25

Item number: 128311145

15 kV BURN OUT SET

T 22/13B

man_t22-13b_en_01-4

FOREWORD

CONSULTATION BY MEGGER

These Operating Instruction are intended to help you solve any questions

and problems as fast and easily as possible. Please start with reading the

manual whenever some problem should arise.

If, however, some question should remain unanswered, please contact one

of the following addresses:

Megger Limited

Seba Dynatronic

Mess- und Ortungstechnik GmbH

Archcliffe Road

Kent CT17 9EN

T: +44 1304 502100

F: +44 1304 207342

E: [email protected]

Dr.-Herbert-Iann-Str. 6

D - 96148 Baunach

T: +49 9544 68 – 0

F: +49 9544 22 73

E: [email protected]

Hagenuk KMT

Kabelmesstechnik GmbH

Megger USA

Röderaue 41

D - 01471 Radeburg / Dresden

T: +49 35208 84 – 0

F: +49 35208 84 249

E: [email protected]

Valley Forge Corporate Centre

2621 Van Buren Avenue

Norristown, PA 19403 USA

T: +1 610 676 8500

F: +1 610 676 8610

Megger

unless Megger have before-hand declared their consent in writing. The content of this

handbook is subject to change without notice. Megger cannot be made liable for technical or

printing errors or shortcomings of this handbook. Megger also disclaims all responsibility for

damage resulting directly or indirectly from the delivery, supply, or use of this matter.

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TERMS AND CONDITIONS OF WARRANTY

Megger will accept a warranty claim brought forward by a customer for a

product sold by Megger under the terms stated below.

Megger guarantees that at the time of delivery Megger products are free

from faults in material and workmanship which would reduce their value

and serviceability to a large degree. This warranty does not cover any error

in the software supplied. During the warranty period Megger will repair

faulty parts or replace them with new parts or parts as new (with the same

usability and life as new parts) at their discretion.

Further warranty claims, in particular those from consequential damage,

cannot be accepted. Each component and product replaced in accordance

with this warranty becomes the property of Megger.

All warranty claims versus Megger expire after a period of 12 months from

the date of delivery. Each component supplied by Megger in the context of

warranty will also be covered by this warranty for the remaining period of

time, but at least for 90 days.

Each measure to remedy a warranty claim must be carried out exclusively

by Megger or one of their authorised service stations.

It is a precondition for accepting a warranty claim that the customer com-

plains about the fault, in a case of an immediately detectable fault within 10

days from the date of delivery.

This warranty does not cover any fault or damage caused by exposing a

product to conditions which are not in accordance with this specification, by

storing, transporting or using it improperly, or having it serviced or in-stalled

by a workshop not authorised by Megger. No claim will be ac-cepted in

case of wear and tear, will of God, or connection to foreign components.

For any damage resulting from a violation of their duty to repair or re-supply

items, Megger can be made liable only in case of severe negligence or

intention. Any liability for slight negligence is disclaimed.

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TABLE OF CONTENTS

1. GENERAL 15

1.1. Safety instructions............................................................... 15

1.1.1. General safety regulations ..................................................... 17

1.1.2. General rules for working with high voltages......................... 20

1.1.2.1. Supplementary instructions.................................................... 21

1.1.2.2. Danger of recurring voltage from space charges .................. 21

1.1.3. Safety instructions specific to the measuring van.................. 22

1.1.4. Dangers of search pulse location .......................................... 23

1.1.5. Indications used in the description......................................... 26

1.1.6 Connection regulations .......................................................... 27

1.2. General functional description ........................................... 30

1.3. Scope of delivery ................................................................. 31

2. GENERAL DESCRIPTION OF

MEASURING PROCEDURES 35

2.1. Introduction .......................................................................... 36

2.2. Pre-locating .......................................................................... 37

2.2.1. Low-impedance fault location ................................................ 37

2.2.2. High-impedance fault location................................................ 40

2.3. Pinpointing ........................................................................... 45

2.3.1. Pinpointing in power cables ................................................... 47

2.3.1.1. Distance method .................................................................... 48

2.3.1.2. Step-voltage procedure.......................................................... 49

2.3.2. Audiofrequency twist method................................................. 52

2.3.3. Distortion-of-minimum method............................................... 53

2.4. Testing medium-voltage cables with DC or AC

voltage................................................................................... 55

2.4.1. Testing with DC voltage ......................................................... 55

man_t22-13b_en_01-4

2.4.2. DC voltage testing of cables with PE or VPE insulation ........ 56

3. TECHNICAL DESCRIPTION 59

3.1. Specifications ....................................................................... 59

3.2. Functional description......................................................... 60

4. OPERATING 65

4.1. Safety measures................................................................... 65

4.2. Controls and displays.......................................................... 67

4.3. Burning.................................................................................. 69

4.4. Pre-locating........................................................................... 72

4.4.1. Pre-locating using the arc surge method ............................... 72

4.4.2. Measurement with the T 32/23 pre-locating unit.................... 72

4.4.3. Ground fault measurements................................................... 73

5. CARE, MAINTENANCE AND REPAIR 77

5.1. Care and maintenance ......................................................... 77

5.2. Repair .................................................................................... 77

5.2.1. Malfunctions ........................................................................... 77

5.2.2. Troubleshooting...................................................................... 78

5.2.3. Equipment failure ................................................................... 78

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TABLE OF FIGURES

Fig. 1-1 Dangers of search pulse location ....................................... 1-24

Fig. 1-2 Connection regulations ....................................................... 1-29

Fig. 2-1 Systematics of fault location and cable testing in power

cables.................................................................................. 2-35

Fig. 2-2 Reflection factor for ohmic faults and changes in cable

type...................................................................................... 2-38

Fig. 2-3 The branched network: idealised reflectograms................. 2-39

Fig. 2-4 Relationship between pulse width and reflectogram .......... 2-39

Fig. 2-5 Usable reflection equipment ............................................... 2-40

Fig. 2-6 Principle of ARM ................................................................. 2-41

Fig. 2-7 Principle of the decay method............................................. 2-43

Fig. 2-8 Test voltage in the cable ..................................................... 2-44

Fig. 2-9 Principle of magnetic field formation owing to differential

current ................................................................................. 2-46

Fig. 2-10 Pinpointing methods............................................................ 2-47

Fig. 2-11 Principle of pinpointing using the distance method............. 2-49

Fig. 2-12 Pinpointing using the step-voltage method (capacitive) ..... 2-51

Fig. 2-13 Fault location using the step-voltage method ..................... 2-51

Fig. 2-14 Twist measurement with search coil on a 2-wire cable ...... 2-53

Fig. 2-15 Pinpointing using the distortion-of-minimum method.......... 2-54

Fig. 4-1 Connection diagram for T 22/13 B 15 kV burn-out set ....... 4-69

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LIST OF ABBREVIATIONS

DIN Deutsche Industrie Norm

(German Industrial Standard)

ESF Energy Seperation Filter

HV High Voltage

IEC International Electrotechnical Commision

UVV Accident prevention regulations applicable in

Germany

VDE Verband Deutscher Elektrotechniker

(Association of German Electrotechnical

engineers)

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